In "Conquest of the Planet of the Apes" (1972), the fourth film in the "Apes" series, cats and dogs had gone extinct by 1991 and humans decided to keep apes as their pets, leading to the great ape uprising in the futuristic Central City (actually the just-completed Century City). In real life, cats and dogs were alive and well in 1991, allowing the world to have the Charles Grodin-St. Bernard movie "Beethoven."
20th Century Fox
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